I just ordered an Underwood and am using a Realist pup. I love the Realist sound, but wanted to get the Underwood for a little more volume when needed. I have a 2 channel AI amp and was thinking about using both channels and have independant controls for each pup. Would I have phase problems with this setup? What is everyone else doing? Would I be better off with a preamp blender? I was even thinking about an a/b/c box to get different sounds on the fly...for arco, pizz.